<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.box{
			width: 200px;
			height: 200px;
			background-color: red;
			padding: 50px;
			border: 10px solid green;
			/*margin-left: 50px;*/
		}
	</style>
</head>
<body>
	<!-- 
	width:内容的宽度
	height:内容的高度
	padding:内边距
	border:边框
	margin:外边距
	 -->
	 <div class="box"></div>
	
</body>
</html>